After Nokia announced its latest devices today, the Lumia 820 and 920, the company saw a stock drop of 15% (0.40) in trading.
The move for Nokia to announce new devices has been widely heralded as a risky move, and has been considered as critical for the company"s continued existence, so the market is likely hesitant of the potential success of the devices, considering the upcoming iPhone launch on September 12.
It"s also worth noting that many smartphone manufacturers see a similar drop when they make announcements of new devices.